Another way of presenting VLF data is in the form of a spectrogram, and here is an example of the same data in this form: The data are divided up into small time segments, in this case 10 ms long. A Fourier transform is performed on each segment, and the color shows the magnitude of the signal. The numerous vertical lines on these spectrograms are radio atmospherics, or `sferics’, originating from lightning strikes, which could be anywhere in the world. Lightning emits short bits of impulsive radiation which can observed be at global distances from the source since they are guided by the Earth-ionosphere waveguide. These correspond to the “click” and “tweek” sounds in the audio sample. A zoom-in a radio atmospheric is shown in the bottom left panel. There are also a set of short horizontal lines between 10 and 15 kHz. These are the `Alpha’ navigation beacons. 1 çay sister kaşığı tuz.
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Read about our HAARP program work in Alaska. Lightning geolocation. Lightning causes $10B of damage every year (in the USA), kills hundreds worldwide, poses a danger to air traffic, and scares the heck out of you when you’re driving. Understanding the physics of lightning requires advanced simulations. Lightning activity is also expected to go up a lot if global temperature continues to rise. Electric fields associated with lightning and quite difficult to measure, because this would involve putting instruments in the middle of a turbulent thundercloud, so we look at clever ways to remotely sense these fields. However, because the radio signature (like a fingerprint) of a lightning strike can be detected around the world, receiving ELF/VLF waves allows us to determine the exact location of most lightning strokes on the whole planet, with just a small number of ELF/VLF receivers scattered around. Online bingo casino australia.
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